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Veins are blue and they have thin walls. They are like tubes and they have three layers. Outer layer consists of tissues and middle layer of muscles and the inner layer are made up of smooth epithelial cells. There are more veins than arteries and the veins are thicker than arteries. Veins take deoxygenated blood to the heart and they transport blood at a lower pressure than arteries. Veins can be seen everywhere in the body and they connect everything but mostly the lungs and heart. There are basically three venous systems in the body. They are Pulmonary Veins, The Systemic Veins and The portal Vein.
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The pulmonary veins contain arterial blood, which they return from the lungs to the left atrium of the heart. There are four pulmonary veins two from each lung and are destitute of valves. They are Right inferior, Right superior, Left inferior and Left superior. They start in a capillary network on the walls of the air sacs, where they are continuous with the capillary ramifications of the pulmonary artery and joining together, form one vessel for each lobule. These vessels uniting successively and form a single trunk for each lobe, three for the right and the two for the left lung. The vein from the middle lobe of the right lung generally unites that from the upper lobe, so that ultimately two trunks from each lung are formed, they perforate the fibrous layer of the pericardium and open separately into the upper and back part of the left atrium. At the root of the lung, the superior pulmonary vein lies in front of and a little below the pulmonary artery. The inferior is situated at the lowest part of the hilus of the lung and on a plane posterior to the upper vein. The right pulmonary veins pass behind the right atrium and superior vena cave and the left pulmonary veins pass in front of the descending thoracic aorta.
The systemic veins return the venous blood from the body to the right atrium of the heart. The major systemic veins are classified in to groups. The head and neck systemic veins consists of the Cranial venous sinuses which joins with the internal jugular vein and ends in the brain, internal jugular, external jugular, subclavian, brachiocephalic and superior vena cava. The arm and shoulder veins are radial vein, ulnar vein, cephalic veins, basilica veins, brachial veins, axillary veins and the subclavian veins. The veins grouped in the trunk portion are brachiocephalic, azygos, hepatic vein, renal vein, testicular or ovarian veins, internal iliac veins, external iliac veins and common iliac veins. The led portion has another group of veins which are anterior and posterior tibial veins, small saphenous veins, great saphenous veins, femoral veins of thighs, external iliac common iliac and inferior vena cava. All these systemic veins in all parts of the body, helps carrying oxygenated blood from the heart and also to carry deoxygenated blood to the heart from all parts of the body. The portal vein is found in abdominal cavity and returns the venous blood from the spleen to the liver. It forms a small network of capillary like vessels, from which the blood is carried.
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